FR2717370A1 - Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery - Google Patents

Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery Download PDF

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FR2717370A1
FR2717370A1 FR9403189A FR9403189A FR2717370A1 FR 2717370 A1 FR2717370 A1 FR 2717370A1 FR 9403189 A FR9403189 A FR 9403189A FR 9403189 A FR9403189 A FR 9403189A FR 2717370 A1 FR2717370 A1 FR 2717370A1
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intervertebral
body
characterized
prosthesis
elastic
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French (fr)
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Moreau Patrice
Elberg Jean-Francois
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Moreau Patrice
Elberg Jean Francois
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7019Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
    • A61B17/7028Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form the flexible part being a coil spring
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7004Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7007Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7004Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002Longitudinal elements, e.g. rods
    • A61B17/7014Longitudinal elements, e.g. rods with means for adjusting the distance between two screws or hooks

Abstract

The prosthesis comprises a hollow cylinder (1) which is slotted radially and/or helically to give it a degree of axial elasticity. The sections (4) between the slots (3) are polygonal in configuration, preferably rectangular, and upper (2a) and lower (2b) parts of the cylinder are solid and bored into axially at both ends, to receive threaded end pieces (5,6). These end pieces are embedded in anchors (11,12) which are fixed beforehand into bones (9,10). The central, hollow part of the cylinder is filled with a visco-elastic shock absorber (15) which runs into the slots (15a), thus forming an elastic tightener with damper being micrometrically regulated which can be blocked by self-locking nuts (7,8).

Description

PROTHESE INTERVERTEBRALE DE STABILISATION PROSTHETIC INTERVERTEBRAL STABILIZATION

L'invention est du domaine des prothèses articulaires destinées à suppléer les déficiences de stabilisation dans les affections articulaires tout particulièrement intervertébrales dans lesquelles le disque en coopération avec les apophyses n'assure plus ses fonctions d'origine. The invention is in the field of joint prostheses designed to supplement the stabilization impairments in joint disorders especially where intervertebral disc in cooperation with the processes no longer provides its original functions.

Le cas limite type est une arthrodèse dans laquelle la mobilité entre deux ou plusieurs vertèbres est gênée ou supprime, ce qui implique la pose d'un pont rigide conduisant & moyen terme, a la destruction des disques sus et sous-jacents. The limit case type is a fusion in which mobility between two or more vertebrae is disturbed or removed, which involves the laying of a rigid bridge leading & medium term, the destruction of the above records and underlying.

On connait de nombreux brevets relatifs à de tels systèmes et en particulier le brevet FR 2631540 permettant, par un jeu de plaques cintrées possédant des trous d'écartements différents, de bloquer les pédicules lombo-sacrés par des cannelures longitudinales. There are numerous patents relating to such systems and particularly the patent FR 2631540 it possible, by a set of curved plates having different spacings holes, block lumbosacral pedicles by longitudinal grooves.

Certains systèmes préconisent, tels les brevets FR 2681525, Some systems advocate such patents FR 2681525,
FR2676911 et EP 346269, l'aménagement d'un amortisseur intervertébral. FR2676911 and EP 346 269, the development of an intervertebral shock.

Une étude antérieure des demandeurs avait d'ailleurs mis en évidence le fait qu'avec la pose d'un ressort hélicoïdal inter apcphysaire vertébral postérieur, le comportement du rachis lombaire se trouvait mélioré en flexion-extension tout en conservant sa mobilité globale. An earlier study of the applicants had also highlighted the fact that with the installation of a coil spring inter apcphysaire posterior vertebral, the behavior of the lumbar spine was Meliore in flexion-extension while keeping its overall mobility.

Une étude plus fine du phénomène intervertébral montre que l'analyse doit s'orienter vers un concept de choc mécanique, plus exact dans la raite transmis selon l'axe vertébral théorique et se répartissant selon trois points d'application ; A more detailed study of the intervertebral phenomenon shows that the analysis should move towards a concept of mechanical shock, more accurate in raite transmitted in the theoretical vertebral axis and dividing by three points of application; le disque et les deux apophyses articulaires constituant ainsi l'assiette intervertébrale d'assise. the disk and the two facet joints and intervertebral plate constituting the seat.

Le rôle d'un stabilisateur dans l'esprit de l'invention est d'absorber les chocs en lieu et place des systèmes défaillants tout en conservant l'assiette intervertébrale en considérant que le disque peut etre envisagé comme un amortisseur idéal alors que les ligaments interépineux jouent le rôle d'un système élastique. The role of a stabilizer in the spirit of the invention to absorb shocks instead of failing systems while maintaining the intervertebral plate considering that the disc can be considered as an ideal damper while ligaments interspinous act as an elastic system.

On peut constater de la sorte que ni les moyens mettant en oeuvre des ressorts ni ceux utilisant des amortisseurs ne peuvent, pris isolément, donner satisfaction au problème posé. It can be seen that way neither the means implementing springs or those using dampers can not, in isolation, to give satisfaction to the problem.

te diagramme forces-déformation d'un ressort est en effet représente par une droite selon laquelle les forces appliquées sont proportionnelles aux fleches tandis que celui d'un amortisseur est représenté par une courbe décroissante selon laquelle les forces appliquées sont sensiblement inversement proportionnelles aux flèches. you-strain diagram forces of a spring is in fact represented by a straight line along which the forces applied are proportional to the arrows while that of a shock absorber is represented by a decreasing curve that the applied forces are substantially inversely proportional to the arrows.

Un ressort ne possède pas de propriétés élastiques isotropes ; A spring does not have isotropic elastic properties; il est anisotrope par définition et sa direction élastique est donnee sensiblement, au flambage près, par son axe géométrique. it is anisotropic by definition its resilient direction is given substantially close to buckling, by its geometrical axis.

Un solide élastique tel qu'un élastomère par exemple est isotrope par définition et sa capacite élastique ne dépend que de sa capacité d'adaptation aux déformations omnidirectionnelles (solide HOOKEEN). An elastic solid such as for example elastomer is isotropic by definition of its elastic capacity depends only on its ability to adapt to the omnidirectional deformation (solid Hookean).

Lorsqu'un solide élastique est mis en oeuvre en tant qu amortisseur, ses propriétés sont en relation avec sa contention ce qui fait que e'il est contenu dans un volume donné, ses propriétés élastiques s'en trouvent modifiées. When elastic solid is used as an absorber, its properties are related to its contention whereby e'il is contained in a given volume, its elastic properties are altered. C'est le cas type d'un cylindre en caoutchouc ajusté dans un cylindre et sollicité en compression. This is the typical case of a rubber roller fitted in a cylinder and loaded in compression.

Ainsi donc, tout système élastique tel qu'avec ressort ou tout système d'amortissement quel qu'il soit, ne peut répondre isolément aux contraintes mécaniques posées au niveau d'une liaison intervertébrale pour la simple raison évoquée cidessus, a savoir que le disque est un amortisseur travaillant conjointement et univoquement avec ses éléments élastique. Thus, any elastic system such as with spring or damping system whatever it is, can not alone meet the mechanical constraints posed at an intervertebral link for the simple reason mentioned above, namely that the disc is a damper working jointly and univocally with its elastic elements.

complémentaires environnants. Additional nearby.

Pour cette raison, les systèmes antérieurs connus ne peuvent donner sastisfaction. For this reason, prior known systems can give sastisfaction.

L'invention propose une prothèse intervertébrale de stabilisation selon laquelle l'assiette de la liason intervertébrale tend å être conservée tout en permettant rassurer, A ladite liaison, ses fonctions originales d'amortissement et d'élasticité. The invention provides an intervertebral prosthesis stabilization whereby the plate of the intervertebral liason tends to be retained while allowing reassure, A said link, original functions of damping and elasticity.

De plus la prothèse proposée est simple dans sa mise an oeuvre, de volume reduit et de réglage de positionnement aisé lors de l'intervention chirurgicale. In addition the proposed prosthesis is simple in its implementation year out, of reduced volume and easy positioning adjustment during surgery.

La suite du texte va en donner la description en référence aux dessins annexés selon lesquels la figure 1 est un schéma en perspective montrant une liaison intervertébrale type; The following text will give the description in reference to the accompanying drawings according to which: Figure 1 is a perspective diagram showing an intervertebral type bond; les figures 2 et 3 sont des vues en coupes d'une liaison type Figures 2 and 3 are sectional views in a link type
L4/L5 en configuratin de flexion et d'extension; L4 / L5 configuration box of flexion and extension; la figure 4 représente des diagramme6 relatifs & des ressorts et amortisseurs; 4 shows the relative diagramme6 & springs and dampers; la figure 5 est une vue en perspective a grande échelle du dispositf selon l'invention dans lequel une partie a été arrachée. Figure 5 is an enlarged perspective view of a dispositf according to the invention wherein a portion has been torn off.

Sur la figure 1 représentant schématiquement en perspective une liaison intervertébrale type telle qu'entre les vertèbres L4 et Figure 1 schematically in perspective an intervertebral connection type such as between the vertebrae L4 and
L5 par exemple,ou l'on reconnalt en partie supérieure L4 le corps cervical Cv, les apophyses transverses Atd (droite) et L5 for example, or one reconnalt upper part L4 cervical body Cv, the transverse processes ATD (right) and
Atg (gauche), les apophyses articulaires Aad (droite) et Aag (gauche), l'apophyse épineuse Ae et le disque Di est interposé entre les deux coups cervicaux CvL4 et CvL5. Atg (left), the articular processes Aad (right) and Aag (left), the spinous process Ae and Di disk is inserted between the two strokes and cervical CvL4 CvL5.

L'assiette du système est assurée par la mise en appui des corps cervicaux sur le disque qui joue le rôle damortisseur et l'assise est complétée par les deux apophyses articulaires pour lesquelles les ligaments associés, notament le ligament interepineux Le, assurent la fonction élastique de l'ensemble. The basis of the system is ensured by the bearing cervical body on disk that acts damortisseur and the seat is completed by two articular processes for which the associated ligament, interspinous ligament The notament, ensure the elastic function from the whole.

Le débattement du point virtuel v par lequel passe théoriquement et instantanément la force F résultant de la charge statique augmentée des chocs dynamiques, s'effectue dans un ellipsoïde E limité par les débattements possibles le long des axes xx' yy' et zz et des rotations XY et Z autour de ces axes, en notant que tous ces déplacements sont anormaux lorsqu'ils restent permanents et que les rotations sont normales dans les limites adimissibles généralement d^^-minFes selon le tableau ci-après The movement of the virtual point v by which theoretically and instantly passes the force F resulting from the increased static load dynamic shocks, is carried out in an ellipsoid E limited by the possible displacements along the axes xx 'yy' and zz and rotations XY and Z around these axes, noting that all these movements are abnormal when they remain permanent and that the rotations are in the normal limits generally adimissibles d ^^ - minFes according to the table below
Zones inclinaison inclination zones
Concernées Flexion Extension latérale Rotation Flexion Extension Rotation affected side
Rachis cervical 60' 649 80 165' cervical spine 60 649 80 165 '
Rachis dorsal 35 50 peu étendue 20' thoracic spine 35 50 bit extended 20 '
Rachis lombaire 60' 45 limitée limitée Lumbar spine 60 '45 limited Limited
Le point virtuel v peut donc se situer instantanément dans lEellipsolde E, image des débattements possibles maximum et la force @ se décompose elle-même en trois forces fl, f2 et f3 dont les points d'appui sont, d'une part, le disque Di et d'autre part les assises des apophyses articulaires Aad et Aag et le triangle ainsi constitué réalise l'assiette du système intervertébral. V The virtual point can lie instantly in lEellipsolde E, image maximum possible deflections and strength @ is itself divided into three forces fl, f2 and f3 whose support points are, firstly, the disc di and secondly Seat articular processes Aad and Aag and the triangle thus constituted performs the intervertebral plate system.

La figure 2 montre schématiquement un défaut intervertebral en flexion frelon lequel le disque Di est sollicité vers la partie externe et la figure 3 montre un défaut inverse où le disque est cette foi6 sollicité vers la partie interne ; 2 schematically shows a default intervertebral bending hornet wherein the disk Di is biased towards the outer portion and Figure 3 shows a reverse fault where the disc is this foi6 biased toward the inner portion; dans les deux cas présentés connus on constate que l'assiette convenable n'est pas conservée 60it par écrasement vers l'avant (figure 2) (flexion) soit par écrasement vers l'arrière (figure 3) (extension). in both cases presented known it is observed that the suitable base is not retained 60it crush forwardly (Figure 2) (bending) by crushing rearwardly (Figure 3) (extension).

La figure 4 montre des diagrammes relatifs aux fonctions mécaniques des différents dispositifs d'amortissement qui peuvent etre envisagés. Figure 4 shows diagrams relating to the mechanical functions of different damping devices that can be considered.

SWr cette figure, le diagramme A représente le cas d'un amortisseur idéal h accélération constante F # = forces appliquées - α SWr this figure, the graph A represents the case of an ideal constant acceleration h = F # damper applied forces - & alpha; = flèche) ; = Arrow); le diagramme B est representatif du ce d'un ressort classique où la force est proportionnelle a la @@@@@ @@ @@@@@@@@ @ montre un amortisseur type t"1 qu'a liquide visqueux sensiblement a accélération constante ; le diagramme C retenu dans le cadre de l'application de l'invention, résulte de la mise en oeuvre conjointe d'un ressort (8) avec un amortisseur (D) réalisant ainsi, au plus près, le cas type d'un amortisseur idéal. panel B is representative of that of a conventional spring where the force is proportional to the @@@@@ @@@@@@@@ @@ @ shows a damper type t "1 has a viscous liquid substantially acceleration constant; C diagram retained in connection with the application of the invention, results from the joint implementation of a spring (8) having a damper (D) thus achieving, as close, if type of a great shock.

La prothèse intervertébrale représentée dans son ensemble sur la figure 5, comporte un corps de révolution oblong creux 1, cylindrique sur la figure, qui est fendu radialement et/ou hélicoïdalement comme représenté sur cette figure, afin de le rcndre élastique axialement et les sections 4 entre fentes 3 présentent une conformation polygonale, telle que rectangulaire dans l'exemple, tandis que les parties 2a supérieure et 2b inferieure sont massives et taraudées axialement, pas droite pas A gauche, pour recevoir des chapes filetées 5 et 6 et la partie centrale creuse du corps 1 est remplie au repos d'un produit viscoélastique d'amortissement 15 flué en débordement interfentes 15a de telle sorte que l'ensemble ainsi réalisé constitue un tendeur élastique avec amortissement, a réglage micrométrique blocable par des écrous autofreinés 7 et 8 tandis que les chapes 5 et 6, & oeilletons sur la figure, viennent s'encastrer dans les moyens d'ancrage 11 et 12 fixés dans The intervertebral prosthesis shown generally in Figure 5, comprises a hollow elongate body of revolution 1, cylindrical in the figure, which is split radially and / or helically as shown in this figure, to the elastic rcndre axially sections 4 between slots 3 have a polygonal configuration, such as rectangular in the example, while the upper parts 2a and 2b are lower mass and threaded axially not right not left, for receiving threaded yokes 5 and 6 and the hollow core the body 1 is filled break a viscoelastic damping product 15 flowed in overflow between windows 15a so that the assembly thus realized is an elastic tensioner with damping, a micrometric adjustment lockable by locking nuts 7 and 8 while the yokes 5 and 6, and eyelets on the figure, are fit into the anchoring means 11 and 12 fixed in les parties osseuses 9 et 10, qui peuvent par ailleurs être un endroit apte quelconque de chaque vertèbre. bone parts 9 and 10 which may also be any suitable location of each vertebra.

Chaque moyen d'ancrage peut être quelconque, mais préférentiellement tel que représenté sur la figure 5, constitue de moyens d'ancrage li et 12 comportant d'un côté une vis taraudPue lia ou 12a bloquée dans les on 9 ou 10 et d'un autre côté, une partie filetée llb ou 12b recouvrant les oeilletons des chapes 5 ou 6 qui se trouvent encastrés par l'effet de blocage des écrous autofreinés 13 ou 14. Each anchoring means may be any, but preferably as shown in Figure 5, constitutes anchoring means li and 12 having on one side a screw taraudPue IIa or 12a is locked in the 9 or 10 and a other side, a threaded portion 12b or llb covering the eyelets of the yokes 5 and 6 which are embedded by the locking nuts 13 or 14 self-locking effect.

Bien évidemment l'aspect intérieur et extérieur du corps 1 est indifférent et c'est ainsi que, lorsque cet aspect extérieur est cylindrique selon la figure 5, des trous 2c sont menaces pour l'introduction de broches 16 permettant la mise en rotation ou l'immobilisation dudit corps 1 complétée par le blocage des écrous 7 et 8 également munis de trous Hans l'exemple présenté afin de permettre l'introduction desdites broches 16. Of course, the inner and outer aspect of the body 1 is irrelevant and so that when this external appearance is cylindrical according to Figure 5, holes 2c are threats to the introduction of pin 16 allowing the rotation or immobilizing said body one completed by the locking nuts 7 and 8 also provided with holes Hans example presented to allow the introduction of said pins 16.

On peut bien entendu envisager toute autre conformations extérieures telles que méplate, hExagonale... pour le corps 1 et/ou les écrous 7, 8. One can of course consider any other external conformations such as flattened hexagonal ... body 1 and / or nuts 7, 8.

De même le corps 1 est rendu élastique axialement par des fentes qui peuvent être radiales et/ou hélicoldales en toute configuration et combinaison possibles, dans la mesure ou sont obtenus conjointement l'effet élastique recherché avec l'effet de rigidite souhaité. Similarly, the body 1 is made axially resilient by slits which may be radial and / or hélicoldales in any possible combination and configuration, to the extent or are obtained together the desired elastic effect with the desired stiffness effect.

Ces deux effets peuvent être préprogrammés par des moyens informatiques resultant par exemple d'examens radio ou RNN préalables et permettre ainsi la conformation informatisee des fentes au moyen d'un usinage adequat par commandes numériques ceci pouvant avoir une certaine incidence sur les colts de réalisation ou la rapidité d'execution. These two effects can be preprogrammed by means of data resulting e.g. radio or examinations prior RNN and thus allow the computerized conformation of the slots by means of an adequate machining by numerical control this may have some bearing on the colts embodiment or speed of execution.

Par ai1 leurs, la determination dimensionnelle du ressort constitué du corps 1 fendu, peut être aidée par les formulations en usage (normes...) telles que par exemple celle. By their ai1, dimensional determination of the spring formed of the body 1 split, can be aided by the customary formulations (standards ...) such as for example one.

données dans l'ouvrage Les Ressorts Hélicoldaux, RPt Techno Nathan-Lavoisier", en particulier pour lu prise en compte des contraintes admissibles # pour le matériau constitutif utilisé. The data in the book Hélicoldaux Springs, RPt Techno Nathan Lavoisier, "especially read taking into account the constraints # eligible for the material used.

Enfin une gaine protectrice souple 17 peut etre disposez le long du corps 1 de manière A éviter des risques de projection de brisures du produit viscoélastique 15, dans la masse ligamentaire environnante. Finally, a flexible protective sheath 17 can be have along the body 1 so as to avoid broken projection risks viscoelastic product 15, the surrounding soft tissue mass.

La mise en oeuvre d'une telle prothèse intervertabrale permet de restaurer, dans une certaine mesure, leb débattements du point virtue; The implementation of such intervertabrale prosthesis restores, to some extent, leb deflections point virtue; va l'intérieur de l'ellipsoïde E et ce par sollicitation conjointe du rassort et du produit viscoelastique qui peut être un élastomère (par exemple) en notant que tous les materiaux utilisés sont biocompatibles comme relà est d'usage et que les dites prothèses peuvent etre disposées en nombres convenables notamment deux å deux entre chaque vertèbre aux lieux et emplacements convenables. is within the ellipsoid E and by biasing the joint rassort and viscoelastic product which may be an elastomer (for example) by selecting that all materials used are biocompatible as RelA is customary and that the said prostheses may be arranged in suitable numbers including pairwise between each vertebra at the proper places and locations.

Claims (4)

  1. REVENDICATIONS 1) Prothèse intervertébrale de stabilisation caractérisée en ce qu'elle comporte un corps de révolution oblong creux 1 tel que cylindrique fendu radialement et/ou hélicoïdalement afin de le rendre élastique axialement et les sections 4 entre fentes 3 présentent une conformation polygonale de préférence rectangulaire, tandis que les parties supérieures 2a et inferieure 2b dudit corps 1 sont massives et taraudées axialement pas a droite-pas à gauche pour recevoir des chapes filetées 5 et 6 et la partie centrale creuse du corps 1 est remplie au repos d'un produit viscoélastique d'amortlssement 15 flué en débordement interfen-es 15a ; CLAIMS 1) A prosthesis stabilization intervertebral characterized in that it comprises an oblong hollow body of revolution 1 as radially split cylindrical and / or helically in order to make elastic sections 4 and axially between slots 3 have a polygonal conformation preferably rectangular , while the upper 2a and lower portions 2b of said body 1 are massive and not threaded axially to the right-not to the left to receive threaded yokes 5 and 6 and the central hollow body 1 is filled break a viscoelastic product of amortlssement 15 flowed in interfen es 15a overflow; I'ensemble constituant ainsi un tendeur élastique b amortissements et réglage micrométrique blocable par des écrous autofreinés 7 et 8 alors que les chapes 5 et 6 viennent 'encastrer dans les moyens ancrage il et 12 préfixés dans les parties osseuses 9 et 10. I'ensemble thus constituting an elastic tensioner b amortization and micrometric adjustment lockable by locking nuts 7 and 8 while the yokes 5 and 6 are 'embedded in the anchoring means 12 and it prefixed in the bone parts 9 and 10.
  2. 2) Prothèse intervertébrale de stabilisation selon la revendication 1 caractérisée en ce que chaque moyen d'ancrage 11 ou 12 comporte d'un côté, une vis taraudeuse lia ou 12a bloquée dans les os 9 ou 10 et d'un autre côté une partie filetée llb ou 12b recevant une chape 5 ou 6 qui se trouve encastrée par l'effet de blocage d'écrous autofreinés 13 ou 14. 2) The intervertebral prosthesis stabilizer according to claim 1 characterized in that each anchoring means 11 or 12 comprises on one side a tapping screw IIa or 12a locked in the bone 9 or 10 and on the other hand a threaded portion llb or 12b receiving a yoke 5 or 6 which is built by the nuts locking effect torque type 13 or 14.
  3. 3) Prothese intervertébrale de stabilisation selon l'une quelconque des revendications 1 ou 2 caractérisée en ce que, lorsque le corps 1 et les écrou. 3) The intervertebral prosthesis stabilizer according to any one of claims 1 or 2 characterized in that, when the body 1 and the nut. autofreinés 7 et 8 sont cylindriques, des trous de réglage, de positionnement et de blocage 2c, 7a, Sa sont ménagés sur l'extérieur et recevable d'une broche 16. Prevailing torque 7 and 8 are cylindrical, the adjustment holes, positioning and locking 2c, 7a, Sa are formed on the outside and receivable of a pin 16.
  4. 4) Prothèse intervertébrale de stabilisation selon l'une quelconque des revendications 1 - 2 ou 3 caractérisée en ce que, lorsTIe le corps 1 et les écrous autofreinés 7 et 8 sont non cylindriques tel qu'hexagonaux par exemple, le réglage, le positionnement et le blocage seffectuent avec une clé plate ordinaire. 4) The intervertebral prosthesis stabilizer according to any one of claims 1 to 2 or 3, characterized in that lorsTIe the body 1 and the locking nuts 7 and 8 are non-cylindrical such qu'hexagonaux e.g., adjustment, positioning and blocking seffectuent with an ordinary wrench.
FR9403189A 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery Pending FR2717370A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9403189A FR2717370A1 (en) 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403189A FR2717370A1 (en) 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery
EP19950400558 EP0677277A3 (en) 1994-03-18 1995-03-15 Spinal prosthetic assembly.

Publications (1)

Publication Number Publication Date
FR2717370A1 true true FR2717370A1 (en) 1995-09-22

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FR9403189A Pending FR2717370A1 (en) 1994-03-18 1994-03-18 Intervertebral stabilising prosthesis for spinal reinforcement inserted during spinal surgery

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Country Link
FR (1) FR2717370A1 (en)

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